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// |reftest| skip-if(!this.hasOwnProperty('Atomics')||!this.hasOwnProperty('SharedArrayBuffer')||(this.hasOwnProperty('getBuildConfiguration')&&getBuildConfiguration('arm64-simulator'))) -- Atomics,SharedArrayBuffer is not enabled unconditionally, ARM64 Simulator cannot emulate atomics
// Copyright (C) 2017 Mozilla Corporation. All rights reserved.
// This code is governed by the BSD license found in the LICENSE file.
/*---
esid: sec-atomics.notify
description: >
Test that Atomics.notify notifies one waiter if that's what the count is.
includes: [atomicsHelper.js]
features: [Atomics, SharedArrayBuffer, TypedArray]
---*/
const WAIT_INDEX = 0; // Agents wait here
const RUNNING = 1; // Accounting of live agents here
const NOTIFYCOUNT = 1;
const NUMAGENT = 3;
const BUFFER_SIZE = 4;
const TIMEOUT = $262.agent.timeouts.long;
for (var i = 0; i < NUMAGENT; i++ ) {
$262.agent.start(`
$262.agent.receiveBroadcast(function(sab) {
const i32a = new Int32Array(sab);
Atomics.add(i32a, ${RUNNING}, 1);
// Waiters that are not woken will time out eventually.
$262.agent.report(Atomics.wait(i32a, ${WAIT_INDEX}, 0, ${TIMEOUT}));
$262.agent.leaving();
});
`);
}
const i32a = new Int32Array(
new SharedArrayBuffer(Int32Array.BYTES_PER_ELEMENT * BUFFER_SIZE)
);
$262.agent.safeBroadcast(i32a);
// Wait for agents to be running.
$262.agent.waitUntil(i32a, RUNNING, NUMAGENT);
// Try to yield control to ensure the agent actually started to wait.
$262.agent.tryYield();
// There's a slight risk we'll fail to notify the desired count, if the preceding
// tryYield() took much longer than anticipated and workers have started timing
// out.
assert.sameValue(
Atomics.notify(i32a, 0, NOTIFYCOUNT),
NOTIFYCOUNT,
'Atomics.notify(i32a, 0, NOTIFYCOUNT) returns the value of `NOTIFYCOUNT`'
);
// Try to sleep past the timeout.
$262.agent.trySleep(TIMEOUT);
// Collect and check results
const reports = [];
for (var i = 0; i < NUMAGENT; i++) {
reports.push($262.agent.getReport());
}
reports.sort();
for (var i = 0; i < NOTIFYCOUNT; i++) {
assert.sameValue(reports[i], 'ok', 'The value of reports[i] is "ok"');
}
for (var i = NOTIFYCOUNT; i < NUMAGENT; i++) {
assert.sameValue(reports[i], 'timed-out', 'The value of reports[i] is "timed-out"');
}
reportCompare(0, 0);
|
